Thank you yet again!! Subsequent to a CVA (“stroke”) and a ton of medical issues, much of my memory was affected and much of everything I encounter now seems unfamiliar. I was asked to tune a set of duplexers for a local volunteer fire department and another for my brother’s family farm. I was at a real loss and couldn’t even grasp much of how my test gear works. I broke out the ‘ol spectrum analyzer and just stared at it dumbfounded. When at a loss for knowledge on the tech front, my “go to” RF, electronics and storytelling genius…. IMSAI Guy! Apparently, according to UA-cam, I’ve already watched every video on the channel over the years. 🤣 I managed to get the tasks completed and also now have a renewed interest in much of my old interests and hobbies. I sincerely appreciate your phenomenal work and you are truly one of the best TEACHERS. So.. Thanks again.
Looking forward to more on this series of spectrum analyzers. Great explanation of each stage of an analog spectrum analyzer. I'm trying to build one out of an ADALM PLUTO SDR by building in some of the stages missing to filter a signal and use the SDR as my spectrum analyzer to view the RF signal in the frequency domain using common control software.
Hi , i am not rf engineer but i like building rf circuits as one of my hobbies but for that it needs spectrum Analyser that why i am interested to learn it . Before watching this video I thought spectrum analyser must have using Voltage tuned capacitor varicap in lc tand and by changing the varicap capacitance by increasing decreasing voltage across vericap we can plot the amplitude . But this isn't the case instead it use band pass filters to scan why ? By the way I don't have any of these fancy equipment? Can i still do related practical experiment of Wave mixing for frequency subtract and summing ... Using very low Frequency in khz range From function generator or by audio signal from sound card ? For leaning ?
you can use a varicap for a voltage controlled oscillator. Lots of radios use that. but just like a radio you need mixers to up/down convert, filters and detectors. the spectrum analyzer is much like a radio design with a vary large tuning range. varicaps have a limited range. The frequency choice for the LO needs to be above what you are measuring so a 1 GHZ spectrum analyzer need to have an LO above 2GHZ and a tuning span of 1GHz
I was asking , why it needs to lower the measuring frequency before probing.? My guess was.. I thought , it's because lots of electronic components don't work well at higher Frequency like ghz and have low gain amplification for higher Frequency !!
So it’s amplitude vs frequency. What makes the amplitude? I get how shouting is higher amplitude than whispering. But what are the energy differences here? Is it *amount* of data transmitted on that frequency? Examples? An analyzer run in silence still picks up peaks, like a GPS signal. What gives that amplitude if it’s not audible volume?
the amplitude is electro magnetic energy, it can be from transmissions from external sources or self generated noise such a clock circuits. the noise the analyzer displays is the same noise that a radio picks up between stations. it is RF sources everywhere even from space. at the very bottom of the noise is electrical noise generated by atoms.
One of the most important electronics videos on YT.
Thank you yet again!!
Subsequent to a CVA (“stroke”) and a ton of medical issues, much of my memory was affected and much of everything I encounter now seems unfamiliar.
I was asked to tune a set of duplexers for a local volunteer fire department and another for my brother’s family farm.
I was at a real loss and couldn’t even grasp much of how my test gear works.
I broke out the ‘ol spectrum analyzer and just stared at it dumbfounded.
When at a loss for knowledge on the tech front, my “go to” RF, electronics and storytelling genius….
IMSAI Guy!
Apparently, according to UA-cam, I’ve already watched every video on the channel over the years. 🤣
I managed to get the tasks completed and also now have a renewed interest in much of my old interests and hobbies.
I sincerely appreciate your phenomenal work and you are truly one of the best TEACHERS.
So.. Thanks again.
Good explanations make difficult things seem easy
Looking forward to more on this series of spectrum analyzers. Great explanation of each stage of an analog spectrum analyzer. I'm trying to build one out of an ADALM PLUTO SDR by building in some of the stages missing to filter a signal and use the SDR as my spectrum analyzer to view the RF signal in the frequency domain using common control software.
Excellent intro thanks, also looking forward to the how and why of this kit most of us can only drool over :-)
Thank you for your informative videos. You explain things very well.
amazing explanation!
Thanks for this Lesson
Nice work
Thanks Sir!
nice videos...i'm waiting for the other videos about SA
Hi , i am not rf engineer but i like building rf circuits as one of my hobbies but for that it needs spectrum Analyser that why i am interested to learn it . Before watching this video
I thought spectrum analyser must have using Voltage tuned capacitor varicap in lc tand and by changing the varicap capacitance by increasing decreasing voltage across vericap we can plot the amplitude . But this isn't the case instead it use band pass filters to scan why ?
By the way
I don't have any of these fancy equipment?
Can i still do related practical experiment of Wave mixing for frequency subtract and summing ...
Using very low Frequency in khz range From function generator or by audio signal from sound card ? For leaning ?
you can use a varicap for a voltage controlled oscillator. Lots of radios use that. but just like a radio you need mixers to up/down convert, filters and detectors. the spectrum analyzer is much like a radio design with a vary large tuning range. varicaps have a limited range. The frequency choice for the LO needs to be above what you are measuring so a 1 GHZ spectrum analyzer need to have an LO above 2GHZ and a tuning span of 1GHz
@@IMSAIGuy you mean frequency of "Lo" local oscillator have to higher then input frequency ? Right ?
@@omsingharjit ua-cam.com/video/yk6rsXnYvk8/v-deo.html
18:16 you mean , its
Because , amplification of low frequency is better suitable for transistors then higher Frequency in uhf vhf range ? That's why ?
i don't understand your question
I was asking , why it needs to lower the measuring frequency before probing.?
My guess was..
I thought , it's because lots of electronic components don't work well at higher Frequency like ghz and have low gain amplification for higher Frequency !!
AM radios are designed in a similar way and do not have any frequency limitations.
@@IMSAIGuy 🤔
So it’s amplitude vs frequency. What makes the amplitude? I get how shouting is higher amplitude than whispering. But what are the energy differences here? Is it *amount* of data transmitted on that frequency? Examples? An analyzer run in silence still picks up peaks, like a GPS signal. What gives that amplitude if it’s not audible volume?
the amplitude is electro magnetic energy, it can be from transmissions from external sources or self generated noise such a clock circuits. the noise the analyzer displays is the same noise that a radio picks up between stations. it is RF sources everywhere even from space. at the very bottom of the noise is electrical noise generated by atoms.
Can you make arduino based spectrum analyser using rf module sl4432 ?
Two of those chips are used in the TinySA spectrum analyzer.
@@IMSAIGuy what is tiny sa , is it SA device or SA software which work with Rtl sdr on pc ?
@@omsingharjit ua-cam.com/video/n6WEM3--Npc/v-deo.html